﻿/*
 *   _____                                ______
 *  /_   /  ____  ____  ____  _________  / __/ /_
 *    / /  / __ \/ __ \/ __ \/ ___/ __ \/ /_/ __/
 *   / /__/ /_/ / / / / /_/ /\_ \/ /_/ / __/ /_
 *  /____/\____/_/ /_/\__  /____/\____/_/  \__/
 *                   /____/
 *
 * Authors:
 *   钟峰(Popeye Zhong) <zongsoft@qq.com>
 *
 * Copyright (C) 2010-2020 Zongsoft Studio <http://www.zongsoft.com>
 *
 * This file is part of Zongsoft.Core library.
 *
 * The Zongsoft.Core is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3.0 of the License,
 * or (at your option) any later version.
 *
 * The Zongsoft.Core is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with the Zongsoft.Core library. If not, see <http://www.gnu.org/licenses/>.
 */

using System;
using System.Linq;
using System.Globalization;
using System.ComponentModel;
using System.Collections.Generic;

namespace Zongsoft.Data;

public class SortingConverter : TypeConverter
{
	public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
	{
		return sourceType == typeof(string) || base.CanConvertFrom(context, sourceType);
	}

	public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
	{
		return destinationType == typeof(string) || base.CanConvertTo(context, destinationType);
	}

	public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
	{
		if(value is string text)
			return Common.StringExtension.Slice<Sorting>(text, ',', Sorting.TryParse).ToArray();

		return base.ConvertFrom(context, culture, value);
	}

	public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
	{
		if(value is Sorting sorting)
			return sorting.Mode == SortingMode.Descending ? "-" + sorting.Name : sorting.Name;

		if(value is IEnumerable<Sorting> sortings)
			return string.Join(',', sortings.Select(sorting => sorting.Mode == SortingMode.Descending ? "-" + sorting.Name : sorting.Name));

		return base.ConvertTo(context, culture, value, destinationType);
	}
}
